Automatic safety device for gas stoves



Feb. 25, 1930.

C. M. PATTY 5R AUTOMATIC SAFETY DEVICE FOR GAS STOVES Filed Dec. 29.1928 2 Sheets-Sheet l AUTOMATIC SAFETY DEVICE FOR GAS STOVES I FiledDec. 29. 1928 2 Sheets-Sheet 2 fnvenmr Aitarnqy Patented Feb. 25, 1930UNITED STATES PATENT OFFICE CHARLES III. PATTY, SE, OF MARSHALL,ARKANSAS, ASSIGNOR OF ONE-HALF TO B. D.

, WEAVER, 0F MARSHALL, ARKANSAS AUTOMATIC SAFETY DEVICE FOR GAS STOVESApplication filed December 29, 1928. Serial No. 829,118.

The present invention relates to improvements in safety devices for gasstoves and the like, and has for its principal object to provide adevice for automatically cutting off the flow of gas to the burnershould the burner accidentally blow out.

Another important object is to provide a safety device of the abovementioned character that includes a thermostatic unit for effecting theactuation of the cut-off means in a positive and eflicient manner shouldthe light of the burner go out, the device embeing disposed forcooperation, with the thermostatic means to .maintainthe valve holdingmeans in an operative position under normal conditions.

Another important'object is to provide asafety device of the abovementioned character that is simple in construction, inexpensive, strongand durable and further well adapted to the signed.

Other objects and advantages of the invention will become apparent fromthe following description when taken in connection with the accompanyingdrawings.

In the accompanying drawings wherein like reference characters indicatecorresponding parts throughout the same:

Figure 1 is a side elevation ofthe safety device embodying myinventionshowing the same associated with a main fuel supply pipe of agas stove. z

Figure 2 is a vertical sectional view taken approximately on the line 22of Figure 1.

Figure 3 is a top plan view of the invenpurpose for which it isdetiontherewith, and

Figure 4 is a sectional view taken approximately on the line 44 ofFigure 3.

In the drawings wherein for the purpose of illustration is shown thepreferred embodiment of my invention, the numeral 1 designates the maingas supply pipe from which extends the jet pipe 2 for supplying gas tothe burner3 which burner may be of the conventional construction such asis found on gas stoves now generally inus e.

Arranged in the jet pipe 2 for regulating the supply of the gas to theburner 3 is the rotary valve 4 that includes a rotary plug having anactuating handle 5 associated therewith. This rotary valve is also ofthe conventional construction, and a detailed description thereof istherefore believed unnecessary in so'far as the present invention isconcerned. j

A valve body 6 is arranged inthe main fuel supply pipe 1, and arotaryplug 7 is mounted in the valve body 6 for controllin the flow of the gasthrough the pipe 1.

horizontally extending arm 8 is formed on' the upper end of the rotaryplug 7 for actuating the same and the outer end of this arm is providedwith an n wardly disposed foot 9, the purpose" of which will bepresently described.

An axial coil s ring 10 encircles the lower projecting end 0 the plug 7,one end of this spring bemg connected to the bottom of the valve body 6,while the other end has connection with a cross pin 11 carried by thelower end of the plug 7. This spring normally maintains the rotary plug7 1n a closed position cutting offv the supply of the gas through thepipe 1. I

Forming a s'alient part of the present invention is the frame 12 that'is secured on the fuel supply pipe 1 by the clamping bands 13 fordisposition adjacent the valve body 6 and this frame extends upwardlyfrom the main gas supply pipe 1.

Arrangedwithin the upper portion of the frame 12 ,is the thermostaticunit denoted generally by the numeral 14, and this thermostatic unitcomprises the vertically arranged upper and lower Waters 15 and 16,

respectively;

An adjusting screw 17 extends through the intermediate portion of thecross bar 18 of the frame 12 for engagement with the central portion ofthe bottom of the lowermost wafer 16 while extending from the top of theuppegmost wafer is the pin 19, the top of the frame 12 being formed withan opening to permit the free vertical movement of this pintherethrough.

The lower portion of the pin is formed with an annular groove 20 toaccommodate the forked end of a lever 21 that is pivoted at its outerend at one side of the frame 12 for vertical swin ing movement.

The pivoted end of the lever 21 is formed with a depending angularlydisposed trigger 22, the lower end of whichis adapted to cooperativelyengage with the upstanding foot 9 formed on the outer free end of thearm 8 to hold the spring actuated valve plug 7 in an open position undercertain conditions. Suitable guide means shown generally at 23 isassociated with the frame and the vertically swinging trigger 22, asindicated in Figures 1 and 3( A substantially U-shaped burner 24 issupported on the frame 12 in such a manner that the jets of thisU-shaped burner are disposed beneath the bottom of the lowermost wafer16. A gas supply nipple 25 is associated with this U-shaped burner 24,and gas is delivered to this nipple by means of a supply tube 26 thatextends from the jet pipe 2. A manually operable valve 27 is arranged inthe nipple 25 to regulate the supply of gas to the U-shaped burner 24. i

When the parts are arranged as shown in Figure 1, the burner 3 is lit asis also the burner 24 and the heat will cause the wafers 15 and 16 ofthe thermostatic unit 14 to expand whereby to maintain the trigger 22 inengagement with the foot 9 so that the valve 7 is held in an openposition permitting the gas to be supplied to the main burner 3 whilethe Valve 4 is in an open position. Should the flame of the burner 24accidentally go out, the wafers 15 and 16 of the thermostatic unit 14will automatically contract causing a downward movement of'the pin 19with the result that the lever 21 will swing'downwardl y and at the sametime the trigger 22 will swing upwardly out of the path of movement ofthe foot 9 and. the spring'lO will auto matical- 1y actuate the plug 7to move the same to a closed position, thereby cutting oil supply of thegas to the mainburner 3.

By actuating the valve 4 to cut off the supply of the gas to the burner3 manually, the gas will also be turned off to the U-shaped burner 24. rY

The valve 7 may be again turned to an open the foot 9 so that said valveplug 7 will be maintained in an open position to permit the flow of thethrough the pipe 1 to the main burner 3, providing of course that thevalve 4 is in an open position.

The provision of a safety device of the above mentioned character willabsolutely prevent the escape of gas in the room, and causing loss oflife. Furthermore, the simplicity of my device enables the same 'to bereadily and easily installed on a gas stove without necessitating anymaterial alterations. Also, my device will at all times be positive andefficient in carrying out the purposes for which it is designed.

While I have shown the preferred embodiment of my invention, it is to beunderstood that minor changes in the size, shape and arrangement ofparts may be resorted to without departing from the spirit of theinvention and the scope of the appended claim.

Having thus described the invention, what I claim as new, and desire tosecure by Letters Patent is In a safety device of the class described, agas supply pipe, a rotary valve mounted in the pipe, spring meansassociated with the rotary valve for normally maintaining the same in aclosed position, an arm extending laterally from the upper end of therotary valve, an upstanding substantially rectangular frame disposedlongitudinally on the pipe adjacent the valve, clamping rings integrallyconnected to the opposite ends of theframe and encircling the pipe forsecuring said frame thereon, a cross bar extending longitudinally of theframe between the upper and lower ends thereof, a thermal elementdisposd between the cross bar and the upper end of the frame, means foradjustably mounting the thermal element in the frame, a burner mountedon the frame beneath the thermal element, and a lever operativelyconnected with the thermal element for actuation thereby to hold saidvalve in open position. V

In testimony whereof I afl'ia my signature.

CHARLES M. PATTY, s

position by swinging the arm 8 into position for engagement with thetrigger22 and by igniting the burner the expansion of the hermostaticunit 14 will effect the actuation

